EP 0580135 B1 19970416 - Carrier for use in electrophotography, two component-type developer and image forming method
Title (en)
Carrier for use in electrophotography, two component-type developer and image forming method
Title (de)
Trägerteilchen für die Elektrophotographie, Zweikomponententypentwickler und Bildherstellungsverfahren
Title (fr)
Véhiculeur pour électrophotographique, révélateur du type à deux composants et procédé de formation d'images
Publication
Application
Priority
- JP 19550192 A 19920722
- JP 19550592 A 19920722
- JP 19550692 A 19920722
- JP 20139492 A 19920728
Abstract (en)
[origin: EP0580135A1] A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier of 5 - 100 mu m in particle size. The carrier has a bulk density of at most 30 g/cm<3>, and magnetic properties including: a magnetization of 30 - 150 emu/cm<3> under a magnetic field strength of 1000 oersted, a magnetization (residual magnetization sigma r) of at least 25 emu/cm<3> under a magnetic field strength of zero oersted, a coercive force of less than 300 oersted, and a relationship of: ¦ sigma 1000- sigma 300¦/ sigma 1000 </= 0.40 wherein sigma 1000 and sigma 300 denote magnetizations under magnetic field strength of 1000 oersted and 300 oersted, respectively.
IPC 1-7
IPC 8 full level
G03G 9/107 (2006.01)
CPC (source: EP US)
G03G 9/1075 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0580135 A1 19940126; EP 0580135 B1 19970416; DE 69309801 D1 19970522; DE 69309801 T2 19971030; US 5576133 A 19961119
DOCDB simple family (application)
EP 93111663 A 19930721; DE 69309801 T 19930721; US 50218295 A 19950713